Reinforced well-tubing



I E. F. HALL.

REINFORCED WELL TUBING.

APPLICATION HLED 1AN.8. 1919.

Patented Feb 10,192&

F/YHLL.

WWD ST R TE eanca EARL-FEANK HALIL, OF DENVER, COLORADO.

BEINFORCED watt-rus ne." V

This invention relates to tubing for use in well Construction, and the object thereof is to build a reinforced article which will be practical, durableand comparatively cheap to manufacture.

Briefiy, the invention comprises a tubular structure having a plurality of tubular parts, one within another, ,some of the parts being shaped for reinforcement.

In the drawings:

Figure l is a cross section on the line l-l of Fig. 2. v

Fg. 2 is -a longtudnal section on line 2-2 of Fig. 1.

Fig. 3 is across section or" a modified form( i p Fig. 4: shows a sheet from which the form of Fig. 3 is rolled.

Fig. 5 indicates diagrammatically the manner of rolling the tube of Fig. 3 from the sheet of Fig. 4.

Referring to Figs. 1 and 2, an outer smooth-surface tube 10 is provided within which a tube 12 with annular corrugations is located. Within tube 12 a third tube 14, with longitudinal corrugations, is placed. It is evident that the corrugations of the two inner tubes strengthen the structure as an entirety, and that having the corrugations of the innermost tube longitudinal will not cause interference with liquid passage.

For securing the different tube elements together, their ends are fiattened or pressed together as at 16, and in order to secure one section to another, threads are formed in each end of each section as indicated at 18, so that one section may be screwed into the next. The corrugations are of such depth that when the ends are flattened the enabout one-half that of the body. Thus the Specification of Letters rat t'.

Application filed January 8, 1919. Serial No. :270,141. i

mettaa renie, 1920.

threaded portions of two sections, 'When joined, equal the thickness of a' body portion, so that the inner and outer diameters are uniform throughout an'entire 'pipe line.

In the' form of Figs. 3, 4: and 5, theentire structure is rolled fronra single sheet having a' corrugated portion ;114` which makes 'the inner section and provides the longitudinal corrugations of the tube, a corrugated portion-ll2, which makes the intermediate section and provides the annular corrugations thereof, 'and a plain portion 110, which forms the outer`-smooth-faced section of the tube. The sheet is rolled as indicated by the line of arrows adin Fig. 5, and the inner edge 120 and the outer 'edge 122 are Secured to the adjacent walls in any manner desired in order to make the tube liquid tight. i

The ends of the tube may be pressed and then provided with threads asin the other form.

` It is evident that this structure provides' a maximum of strength for the minimum of weght. The longtudinal corrugatons re-,

sist the longitudnal compression which oc curs when the tube is driven and as pointed out do not resist liquid passage. The horizontal corrugations resist lateral compression which would tend to collapse the tube. The outer smooth section of the tube reduces friction to the minimum whenthe tube is being driven. 'This makes a highly serviceable, and at the same time a light weight, tube for well Construction.

I claim:

1. A tubular structure, comprising a plurality of tubular elements located one within another and having their ends pressed together and threaded, the threads being pressed into the structure so as to appear on both the inner and outer surfaces thereof. 4

2. A tubular structure comprising a plurality of tubular elements located one within another, certain of said elements being corrugated, and having their ends pressed together to eliminate the corrugations and threaded, the threads being pressed into the structure so as to appear on both 'the inner and outer surfaces thereof.

3.'A` tubular structure, conprising a plurality of tubular elements located one within another, certain of said elements bee ment extending in a direction different from those of another.

4. A tubular structure, comprising a plurality of tubular elements located one within another, certain of saidelemen'ts being corrugated, the corrugations of one element eX- tending in 'a 'direction 'difi`erent from those of another, the corrugations of the innermost element extending in a direction longitudinal 'of 'the structure, the inner ends of the elements 'being pressed together and provided with means for connecting one section of such a tubular structure to another.

5. A tubular structure, comprising a plurality of tubular elementslocated one within another, certain of said. elements being corrugated, the ends of said elements being pressed together and for-med with means for i connecting one section of such a tubular struc' i ture with anothe similar section, the thicl ness of the corrugated part o' each section bemg substantally twice that of the pressed end portions, so that the dameters of joined sections Will be uniform throughout the body portions and the joints.

6. A tubular structure, oomprising a plurality of tubular elements located one within another, the innermostelement having longitudinally extending corrugations, an intermediate element having horizontal cer.- rugatons, and an outer element having a smooth outer surface, said elements being Secured to form an operative whole.

7. A tubular structure, comprsing a single sheet of material in theform of a plurality of convolutions 'one' within another, one convolution being smooth and another being corrugated.

8. A tubular structure, compris ing a single sheet of material in the form of aplurality of convolutons one within anothen one convoluti'en being smooth and two being corrugated, the corrugations of one being at angle's to those of the other.

' 9. A tubular structure, comprising a single sheetol material in the form of aplurality of convolutions one within another, ene convolution being smooth and two being corrugated, the corrugations of one being at angles to those ofthe otherthe innermost being one of the corrugated convolutions and having its corrugations extending longitudinally of the tube. i lO. A blank adapted totubular structure com'prising a fiat portion of sut'tlcient eX-tent to make -one member, and a corrugated 'portion sufficient to make another member, of said tubular structure..

11. A blank adapted to be rolled into a tubular structure comprising a fiat portion of suiieient eXtent to make one member, and two corrugated portions whose corrugations' are at angles to each other, each being sufiicient to make another member of said structure. i 4

12. A blank adapted tobe rolled into a tubular structure comprising a fiat portion of suificientextent to make one member, and two corrugated portion's whose corrugations are at angles to each other, {each being suflicient to make another member of said structure, one end portion being the fiat portion, and the other end portion being corrugated, the corrugations of the latter eX- tending longitudinally thereof. y

In testimony whereof I affiX my signature' EARL FRANK HALL.

be 'rolled into a i 

